Reenforced-concrete mast



sept. 1, 1925.

K. KISSE REENFORCED CONCRETE MAST Filed July 8, 1922 2 Sheets-Sheet 1 Sept. 1, 1925. 1,552,399

. K. KISSE REENFORCED CONCRETE MAST Filed July 8.. 1922 2 Spats-Shoot 2 Patented Sept. 1, 1925.

UNITED STATES KONRAD KISSE, OF BERLIN, GERMANY.

REENFORCED-GONCRETE MAST.

Application filed July 8,

To all whom it may concern:

Be it known that I, KONRAD Kissn, a citizen of Germany, residingat Berlin, Germany, have invented certain new and useful Improvements in Reenforced-Concrete Masts, of which the following is a specification.

This invention has reference to reenforced concrete poles and it is intended to generally improve and facilitate the construction of poles of this kind, and to devise means for increasing the strength and the resistance thereof. As a substitute for the usual wooden or iron poles with their many inconveniences and disadvantages tubular reenforced concrete poles have been known for some time which have usually been made by centrifuging. These reenforced concrete poles, however, present great inconveniences, particularly in View of the high costs of erection and great weight involving considerable expense for transformation and mounting. Reenforced concrete poles of starshaped sect-ion have also been suggested, but they present unfavorable structural conditions, inasmuch as they do not admit the insertion of suitable and sufiicient reenforcements, so that a sufficient bending resistance is not obtainable, except by'employing unduly large masses of material.

These inconveniences are overcome in accordance with my invention by providing the poles with a particularly favorable cross sectional shape. My invention is particularly distinguished by the fact that each web of a pole of star-shaped section terminates in a beam of hammer-like cross section in which the iron bars or rods provided for reenforcing purposes in the longitudinal direction can be spaced apart in a most favorable manner, while at the same time the concrete is closely encircled with iron in accordance with Considrs method, so as to produce inflexible beams at the ends of the webs and to obtain the maximum efiiciency with reenforcement.

1922. Serial No. 573,537.

Figures 4 and 5 are details of the reenforcing means shown n Figure 3. V

Figure 6 1s a cross sectional view of another modification of reenforcement ofthe pole.

Figures 7 and 8, are details of the reenforcement shown in Figure 6.

As shown in Figures 1 and 2, the radial webs 2 are provided at their outer ends with beams 1 of hammer-like cross section by which great tensional strength is obtained. In consequence thereof, such radial webs may be comparatively thin-walled. As appears from Figure 2, all parts of its cross section are enlarged in downward direct-ion. The hammer-shaped beams 1 of the pole are connected at certain intervals by transverse ribs 3 or the like which assist in preventing lateral bending. I

Longitudinal reenforcing bars 4 are arranged in the hammer-shaped beams l and in the centre of the polea longitudinally extending rod 5 is mounted which, may be replaced by a tube, in case that it is desired to pass conduits, conductors or the like through the pole. Reenforcing in transverse direction may be effected in the usual manner by means of struts or clips (not shown) which surround the longitudinal irons 4 in the hammer-shaped beams and the rod 5 in the middle of the post. It is, however, preferable, particularly in order to facilitate manufacture, to effect transverse reenforcement in a manner well known per se by means of spirally wound wires or iron rods.

For the purpose of fixing the spirally wound wires 8 iron loops 6 and 7 may be employed, the loops 6 being placed around the rods 4, while loops 7 are placed around the central rod 5, their hook-shaped ends engaging the wires 8 and retaining the same in position.

Instead of the rods and wire loops referred to, I can also employ, according to Figures 6-8, angle irons 9 the web portions of which are provided with indentations or hooked-shaped projections 11, the wires 8 being wound around the angle irons and secured in position in the hooks 11.

The relatively narrow spaces between the reenforcing members interfere, of course, with the introduction of the concrete. It is advisable, therefore, to employ thin liquid concrete in making these poles and to make provision for securing a uniform and thorough distribution of the concrete throughout the'm'ast. This may for instance be efi'ected by striking the mould from without with suitable hammers operated by compressed air or by mechanical means, while filling the mould with concrete. By this operation the concrete is not only force-d into all the parts of the mould, but also all iron parts are completely surrounded with concrete, while the formation of air bubbles is avoided, inasmuch as such bubbles are detached from the iron by the'ha-mm'er blows and are caused to rise to the "surface. I also prefer subjecting those-parts of tlrereIenfo-rcing rods or bars which project from the con- "crete to vibration by striking them with the hammer, thereby submitting all iron parts to violent vibration which causes the air bubbles still "adhering thereto to become detached.

Other means of connecting the several parts and of securing their uniform arrangement may be employed .i1ico1mettio11 with iny invention, and various modifications and changes may be made'to particularly adapt the invention to varying conditions of 'ap 'plication.

1. Reenforced concrete pol'e comprising thre concrete beams of substantially triangular cross section disposed about a common centre with one side of each pole averted from said centre, concrete webs or smaller cross-sectional area extending from said beams inwards and meeting in said centre, a longitudinal reenforci'ng member in said centre and a plurality or longitudinal reenforcing members in each beam.

2. Reenforced concrete pole comprising three concrete beams of substantially triangular cross section disposed about a common centre with one side of each pole averted from said centre, concrete webs of smaller cross sectional area extending from said beam inwards and meeting in said "centre, a longitudinal reenforcing member in said centre and a longitudinal reenforcing member in each corner of each beam.

3. Reenforced concrete pole comprising three concrete, beams of substantially triangular cross section disposed abouta common centre with one side of each pole averted from said centre, concrete webs of srnallerv cross sectional area extending from said beams inwards and meeting in said centre, a longitudinal reenforcing member in said centre, a plurality of longitudinal reenforcing members in each beam and transverse reenforcing members extending from said beams across *said webs to said centre.

4:. Reenforced concrete pole comprising three concrete beams of substantially triangular cross section disposed about a common centre with one side of each pole averted from said centre, concrete Webs of smaller "cross sectional area extending from said beams inwards and meeting in said centre, a longitudinal reen-forcing member in said centre, "a longitudinal ree-nforcing member in each corner of each beam and transverse r'eenforcing member's extending from said central r'eenforcing member across said webs to and around the reenforcing members in said beams.

5. Reenforced concrete pole comprising longitudinally and radially extending concrete webs forming the central body, long itudinally extending concretebeams or hammer-like cross section at the outer'ends of said webs, central longitudinal reenforcing member extending in the meeting point or said radial webs, a plurality oi lateral longitudinal reenforcing members in each of said beams, transverse reen-forcing means extending from said lateral members across said webs to said centralmeinber and hooks formed on said lateral 'inember's in fixing said transverse reentorcing means in position on said members.

6. Reenforced concrete p'ole comprising longitudinally and radially extending eon crete webs forming the central body, 1ongitudinally extending concrete beams of hammer-like cross-section at the outer ends of said webs, a central longitudinal reenforcing member extending in the meeting point of said radial webs, a plurality of lateral longitudinal reenforcing members of angular cross section in each of said beams, transverse reenforcing means extending from said lateral members across said webs to said central member and hooks formed on said lateral members for fixing said transverse reenforcing means in position on said members.

In testimony whereof I afiix my signature.

KONRAD KISSE. 

